Nope - never mind.  Plenty of successful traffic with the sec-ch-ua*
headers.

I'll keep poking re: PH/500 w/o "show errors", and confess here when/how I
find it is the result of being ignernt.

On Mon, Oct 18, 2021 at 11:41 AM Jim Freeman <[email protected]> wrote:

> Ran tcpdump on the proxy in search of useful detail.
> Saw these unfamiliar (to me) headers on the PH/500 'd request :
>
>  sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90"
>  sec-ch-ua-mobile: ?0
>
> Googled, found : https://www.chromium.org/updates/ua-ch, was a tad
> FUD'd by
> ===
> Possible Site Compatibility Issue
> UA-CH is an additive feature, which adds two new request headers that are
> sent by default: `sec-ch-ua` and `sec-ch-ua-mobile`. Those request headers
> are based off of Structured Field Values, an emerging standard related to
> HTTP header values. They contain characters that, though permitted in the
> HTTP specification, weren’t previously common in request headers, such as
> double-quotes (“), equal signs (=), forward-slashes (/), and question marks
> (?). Some Web-Application-Firewall (WAF) software, as well as backend
> security measures, may mis-categorize those new characters as “suspicious”,
> and as such, block those requests.
> ===
>
> HAProxy tends to be up on all such things, but any chance the PH/500 could
> be related ?
>
> Thanks,
> ...jfree
>

 https://www.mail-archive.com/[email protected]/msg41272.html
Added headers :

content-security-policy: frame-ancestors 'self' https://*.primarydomain.org
https://*.related.domain.org;

x-frame-options: SAMEORIGIN

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